Remote control apparatus



Oct. 3, 1933. E. M. ALLEN ET AL REMOTE CONTROL APPARATUS Original FiledFeb. 17, 1950 INVENTORSZ 5..19/16/7, lq Q B Bro 0K5,

a if M (Lial bodying our invention.

Patented Oct. 3, 1933 1,929,047 nEMoT E ooN'rRoL APPARATUS Earl Allenand chimes A. Brooks; Swissvale, Pa.., assignorsto The Unionzswitch &Signal- "Company, Swissvale, 1 Pennsylvania Pa., a corporation ofApplication February 1 7, 1930. Serial No. 428,966

" Renewed March 27,1931

29 Claims (Cl. a n) Our invention'relates to remote control apparatus,and has for anobject the provision of novel and improved apparatus -forcontrolling railway trafiic governing-devices such as switches 5 andsignals from a distant point.

We will describe one form of apparatus embodying our invention, andwillthen point out 15, stretches Y and Z adj acent switch G are divided thenovel features thereof in claims. ,7 The accompanying drawing is adiagrammatic view showing one form of apparatus em- 'Referring to thedrawing, the reference characters 1 and 1f? designate the track rails ofa stretch Y of railway track connected by means .of a switch G with astretch Z. Portions of i by means of insulated joints 2 to form tracksections AB, CD, B,E-D .and -E-F. Each of these sections is providedwith a track circuit which includes a battery 3 connected across the jrails adjacent one end of the section, and a track relay designated bythe reference character 'T with a distinguishing exponent and connectedacross the rails adjacent the v opposite end oi the section. V ISignalsdesignated by the reference characters S S 5 andS governeastbound trallic moves, that is, moves toward the right as shown in thedrawing, overswitch G, and signals S S and S 9. govern westbound movesover switch G. Signals Sl S S and S governmoves over switch G in itsnormal position as shown, for directing traflic along stretch Y only.Signals 8 S S and S 9; govern moves over switch G reversed, from or tostretch Z respectively. As shown in the drawing, each" ofthese signalsis of the semaphore type. Each of the signals operates a contact armwhich connectswith'a given terminal when the signal. is indicating stop,

' 4 andwhich connects With'a second terminal when the signal isindicating proceed, For example, signal S operates contact arm 35, whichconnects with terminal 35 when signal S is indicating stop, and whichconnects with terminal 35 when signal S 9 is indicating proceed.

Switch G, as here shown, is operated by a fluid pressure motor M whichis controlled by a lock magnet L and by normal and reverse magnets N and63 to theleft, asshown'in the drawing,;and

contact arms to theright; I a

Operated in conjunction with switch G are contact arms 21 and 27 whichconnect with terminals Zl and 27 respectively, when and only when switchG is in its'normal position. Conwhich,'when inagnet R is energized,swings these times except while switch G is in its normal position;Contacts 62- -62 6161 and 64,=also op.- erated in conjunction withswitch G, are closed at all times except while switch G is in its.reverse position. Contacts-62-,62 and 61--61 are closed when and onlyverse position.

.S witch relay I-I is energizable inthe normal or the-reverse directionby a circuit whichsis controlled by amanually operable lever .V 1 LeverV .has two positions,- a normal'position n and .a

when switch G isin. its re- 7 Switch indication relay K is controlled byFill:

contact arms 20 and 63 which are operated by magnets N andR, and is alsocontrolled by the V 7 contact arms which are operated in conjunctionwith switch G, and by switchrelayH If the lay K is ,deen'ergized, relayH responds; but the resistance of the circuit is great enough to preventthe flow of suflicient current to operate-an H? and which isshown'adjacent levefV When motor M responds to control" by reIayJ-I -andmoves switch G to a correspondingposition, relay K be comes energized ina direction which corresponds with the position" of switch G and controlcircuit for relay H is energized while reindication relay h whichisinseries with relay I H with the directionof energizat-ion'of relayI-IRelay K uponbecoming -energized, forms a shunt path around, aresistance'9 in the clrcuit for relay H uand also around a portion ofthe winding of relay H ythus permitting suflicient andv at the sametimetoret ain the contacts of relay H 'in an" energized position. r

' Normal and reverse switch indication relays. k and'k areenergized whenrelay K is enercurrent to flow in the circuit to;operate-relay]:

gized in the normal or thejreverse direction, re-

spectively. V V V Signals S are controlled by apolarizedzsigna relayHOne of the signals'SP- or'one of the S are indicating stop. A proceedsignal indica-- tion relay K is energized when and only when any one ofthe signals S or S is indicating proceed. A signal stick relay I iscontrolled by stop' signal indication relays K and K and by track relayT An approach locking stick relay U is controlled by traflic conditions.as well as by stop signal indication relay K and by a manually operablecontact P An approach locking stick relay U is similarly controlled bytraffic conditions as well'as by stop signal indication relay K and by amanually operable contact P "The energization of relay H in the normalor the reverse direction is controlled by a manually operable lever Vhaving a normal position m, a reverseposition to the left I, and areverse positiontothe right it. The. lever V operates a contact arm 70which, when the lever is in its position, connects with a terminal 70and whenthe lever is in its t position, connects with a terminal '70". Acontact arm 93, also operated by lever V similarly connects with aterminal 93 when lever V is in its] position, and connects with a aterminal 93 when the lever is in its t position.

If the circuit for relay H is energized while I proceed signalindication relay K is deenergized,

relay H will respond, but the current flowing will. beinsufficient tooperate a second proceed signal indication relay h which is connected inseries with relay H Upon the clearing of a signal due to the.energization' of relay H relay K becomes energized. Relay K uponbecoming energized, forms a shunt path around a resistance 67 which isin series with relays h? and H This shunt path also passes around aportion of the winding of relay H With the resistance of the circuitthus reduced, sufficient current will flow to operate relay h as well asto retain the contactsrof relay H in an energized position.

'; Indicators, here shown as electric lamps each of which is designatedby the reference character e witha distinguishing exponent, are placedadjacent levers V and V5 for the information of theoperator. Lamp e iscontrolled by a back contact of relay h and, when lighted, at timesindicates thattrack section BED is occupied. Lamp e ,.when lightedduring an operation of switch G from one position to the other,indicates that the movement of switch G has not yetbeen completed. inresponse to a change of positionof lever .V Lamps e, and e arevcontrolled by contacts 2929 and 2929 respectively, of lever V as well asby a' front contact of relay, h Lamp e when lighted, indicates thatswitch G is in the normal position while lever V is in its nposition,and lamp .e indicates that switch G is inthe reverse position whilelever V5 is in its 1 position. Lamp c is controlled by a back contact ofrelay h and, when lighted, indicatesthatnone ofthe signals isinspectively, of lever V ,and by a front contact of relay n5. Lamp e,when lighted, indicates that A one of the signals S controlled by leverV when in its j position, is indicating proceed. Lamp e,

and the winding of relay I to terminal 0.

and K are energized. Relay W has a, stick circuit which includes aportion'of'the circuit for relay H comprising relay h contact '?0--70 or"IO--70 of lever Y and a battery Q or a battery Q respectively.

As here shown, batteries Q and Q also supply energy for lightingindicator lamps e. Current for controllingthe local circuits for switchG and signals S is supplied by a battery Q and a battery Q In thedrawing, the contacts operated by the various relays are identified bynumbers, such numbers having suitable distinguishable exponentswhen'such contacts are not shown adjacent the respective relays by whichthey are operated. Theexponent for each of these contact numberscomprises the reference character and exponent for the respective relay.For example, the exponent K for contact '73 shown "in the local controlcircuits for signals S comprises the reference character K and theexponent S for stop signal indication relay K which operates;

contact. 73 Similarly, the exponent W for contact 89 in the localcircuit for signal S comprises the reference character W for call-onrelay W which operates contact 89 7 Having thus described, in general,the arrangement, operation, and location of the various parts comprisingour invention, we'will now trace in detail the operation of theapparatus.

As shown in the drawing, all parts are in their normal condition, thatis, lever V is in its n position, lever V is in its m position, switch Gis in its normal position, all signals are indicating stop, and alltrack sections are clear.

With signals S indicating stop, stop signal indication relay K isenergized by its circuit passing from terminal 3: of battery Q throughcontacts 35-35, 36-36, 37-37 and 3838 of signals S ts S and S,respectively, and the winding of relay K to the other terminal 0 'ofbattery Q 'With signals S indicating stop, stop signal indication relayK is energized by its circuit passing from terminal r through contacts3939, 40-40 and 4141 of signals S S and 8 respectively, and the windingof relay K to terminal 0. I

With relays T and T energized, approach locking relay U is energized byits circuit passing from terminal 1 through contact 46 of relay Tcontact 47 of relay T and the winding of relay U to terminal 0. A stickcircuit for relay U is also completed, passing from terminals r throughcontact 48 of relay K contact 51 of relay U and the winding of relay Uto terminal 0. Withrelay T energized, approach locking relay U isenergized by its circuit passing from terminal r through contact 52 ofrelay T and the winding of relay U to terminal 0. A

stick circuit for relay U is also completed, passing from terminal mthrough contact 53 of relay K contact 57 of relay U and the winding ofrelay U to terminal 0;

With relays T K and K energized, the pick-upcircuit for relay'I iscompleted, passing from terminal x through contact 42 of relay T contact43 of relay-K contact 44 of relay K A stick Jt ry Q- s r f lay'Henergized in' the normal direction, as well circuit for relay I is alsocompleted, passing fi'om terminal :0 through contact 42 of relay atum,5-5-of lever, V winding of relay h wire 6,

contact 7'", wirelO, contact 11 of relay K wire 12, aportion of thewinding of relay H and wires 13 and 13 back to. batteryQ With relay Henergized in thenormal direction and with relays I, U andU energizednormal magnet N for switch G is energized byits circuit passingIromterminal r of battery Q through-front contacts 14 1 5 and'lficontacts 17 andlB of relay H wire 19, the winding ofmagnet N to terminal0, and throughbattery Q back to bat- Wlth 'magnetN energized'and withreas with switch G inthe normal position, relay through contact 20 --2 0operated by magnet N,

contact 21 -2l or switch contacts 22 and 23 of relay H winding of relayK contacts 24 and 25a *0: relay H wire. 26, and contact l7-2'7 of switchG to terminal 0. With relay K energized in thenormal direction, normalindication relay k is energized by its circuit passing from terminal:cflthrough contacts 33 and 34 of relay K f'andthewinding of relay k toterminal 0.

lflow to operate relay h With relay It? thus .28, contact 29-29 of,lever V and'contact 30 of relay 119 back to battery Q energized, lamp cis lightecl by its circuit passing Irom battery Q through wire 13,lamp'e wire The circuit Ior relays h and'I-li is open at contact arm '70of 'lever v and henceboth these ,relaysare deenergized.

We will now assume that the operator desires to arrange for a train tomove from stretch Z to stretch Y over" switch G reversed. He thereforemoves lever V to the '1 position, and lever V to the t position. Lever Vupon being moved from the n position toward the 1' position, breaks, atits contact 5 -5; the circuits for relays h and H Relay H upon becomingdeenergized, opens its contacts 23 and 24 causing relay K to bedeenergized and open its contact 11.

When lever V reaches its r position, relays h and H will be energized inthe reverse direction by a circuit passing from battery Q through wires13* and 13 winding of relay H resistance 9, wire 8, contact '7', wire 6,winding of relay h and contact 5'5' of lever'V back to battery Q Relay Hupon becoming energized in the reverse direction, completes a shuntcircuit for relay K passing from relay K, through contacts '23 andrelayK will become deenergized eventhough'- the circuit first traced forrelays h and H should be supplied with current of reverse polarity I hand; close its front contact 31*. With contact .il

before relay K has openedits contact 11.

With relay H energized in the. reverse direction, a circuit is completedfor .magnet R of Gg passing from terminals: of battery'Q Upon thebeginning of the operation of switch battery Q otmagnet R to terminal 0.-With relay K deenergized, a circuit for lock magnet L is alsocompleted, passing fromterminal x of battery Q through contact 59 ofrelay K ,-wire 60, and the winding of magnet L to terminal 0. WithmagnetsLand R thus energized, motor M is so controlled as to movesw'itchG to the reverse position.

G, contact arms2l and 27 are moved to connect with terminals 21 and27,"respectively, and contact"65"is closed; With contact 6 5"closed, asecond circuit is completed'for magnet L, passing from terminal :2 ofbattery Q through contacts 64 and '65 of switch G, wire 60, and thewinding of magnet L to terminal 0. Upon the completion of=the operationof switch G to its reverse position, contact arms 62 and 61 are movedto' connect-with terminals 62*. and 61 respectively, and contact 64 isopened.

K? is energized in the normal direction by its circuit passing fromterminal 3: of battery On account, of magnet R being energized, armaturehas moved'contact arms 20 and 63 to connect'with terminals 20 and 63respectivelyfand hence when contact arms 62 and 61100 are 'ino'ved; asjust described, a reverse control circuit is'completed for relay Kpassing from tact 62-62 of switch G, and contact 6363 of rnagriet R toterminal'o. Relay K upon becoming energized, againcompletes, through itscontact 11, the shunt path previously traced 'around resistance 9 and a'portion of the winding of relay H Uponthe completion of this shuntpathfsufficientcurrent flows through the circuit for relays h andH tocause relay h to again become energized. I

While relay M has been deenergizedJamp e has beenlighted by its circuitpassing from battery Qfl through wire 13, lamp e and contact 30 of relayh back to batteryQ.

Lamp 6 while thus lighted, has been indicating to the leverman thatswitch G has not yet completed its movement to the reverse position.Upon the 'reenergization' of relay h as just described, lamp 6 becomesextinguished, and lamp e becomes lighted by its circuit passing frombattery Q through wire 13*, lamp e, contact 29 29 of Iev'er'VQandcontact 30 of relay h back to With lampe lighted, the operator knowsthat switch G has been moved to thereverse position in response to themovement of battery Q supplies current of reverse polarity to relays hand H 'by a circuitrpassing from battery Qflthrough wires 13?, 13", 13and 13 winding of relay H resistance 67; wires 69 and 69, winding ofrelay 'h and contact 'l0'70 of lever V back to battery QM Relay Hresponds by closing its contacts 71 and 72', but the current flowing inthe circuit is not suificient tocause' relay it to open its back contact31 closed while leverfV is in its t position, lamp emialighted by itscircuit passing from battery Qflthrough' wire liifielamp e wire 32,contact 150 31 of relay h and contact -70? of lever V back to battery Q.I i

.With relay H energized in the reverse direction as justldescribed, andwith relay k energized, a circuit is completed for signal S P,passingfrom terminal 2 of battery Q through contacts 71 and 72 of relayH5, contacts 73 74 76'", andthe mechanism of signal S to terminal 0. Thearm of signals now movesto its proceed position, breaking at its contact37-37. the circuitrfor relay K and then completing at its contact 3737the {circuit for relay K passing from terminal at of battery passingaround resistance 67 and a portion of the winding of relay H reduces theresistance in the circuit for relays 11 and Hi and so permits suflicientcurrent to flow through the circuitto cause relay it to open its backcontact 31 and close its front contact 31 Upon the opening of contact 31lamp e becomes extinguished, and

upon the closing of contact'31 lamp c becomes lighted by its circuitpassingrfrom battery Q through wire 4 contact 31 of relay h contact 9393of lever N lamp eRand wire 13 -back to battery Q With lamp e? lighted,the operator knows'that the arm of signal S has been operated to theproceed position in responseto the movement of lever V to its 25position and the operation of switch G to its reverse position.

We will now assume that an eastbound train approaching signalS};deenergizes relay T The stickvcircuit already traced for relay U hasbeen broken at contact 48 upon the deenergization of relay K and hence,upon the deenergization of relay T which causes its contact 47 to openin the pick-up circuit previously traced for relay U relay U becomesdeenergized. Relay U upon becoming deenergized, breaks, at thefrontpoint of'its contact 15, the circuit previously traced for magnet R ofswitch G, and completes at the back point of its contact l5 a secondcircuit for magnet R passing from terminal 3: of battery Q through frontcontact 14 back contast 15, contact 94 of relay K wire 58, and" thewinding of magnet R to terminal 0. 7 It follows that with relay Udeenergized, the position of switch G can not be influenced by a changein direction of the energization of relay H As the train proceeds pastsignal 8 it deenergizes relay T causing relay I to be deenergized. Relay1, upon becoming deenergized,

breaks, at its front contact M the second circuit just traced for magnetR, and completes, at its back contact. 14 a third circuit for magnet R,which is the same as the second circuit except passing through the backcontact 14 rinstead of through the front contact l4 and back contact 15.It follows, therefore, that while relay I is deenergized, switch G willnot be influenced section -C-D, deenergizing relay U as previously byany change in the directionof energization of relay H Relay- I, uponbecoming deenergized, also opens its contact 75 in the circuitpreviously traced for signals. The arm of signal S thereupon moves toits stop position, breaking, at it s'contact 37-37% the circuit/forrelay K and then completing, at'its contact .37-37, the circuitpreviously traced for relay ing of relay H The current flowing in thecirt1 cuit of relaysh and H is thereby so reduced as to cause relay htoopen its front contact 31 and close its back contact 31 Lamp e is thusextinguished, and lamp e is again light as previously described,indicating to the operator that (111 the arm of signal sl 'has left itsproceed position. k i J The circuit for .relays'h. and H 'is open atcontact 7?, causing relay n to become deenergized and extinguishlamp eand then light I lamp e The lighting of lamp e now indicates to theoperator that a train has entered section B-E-D. Relay H 'is alsodeenergized, causing relay K tobe deenergized and to again complete thecircuit for lock magnet L through contact 59 of relayK With relay Kdeenergized, relay k is deenergize'd due to the opening of contact 33 ofrelay K The train, upon entering section EF while relay T isdeenergized, completes, at contact 50 U to terminal o.- A pick-upcircuit commonly" includes back contacts of ..tw0, track relays inseries as, for example, contacts 49 and 50 of ;relays T and Trespectively, in the second pickup circuit which we have traced forrelay U The use of back contacts of two track'relays in series insteadof a back contact of only one track relay prevents thepossibility of arelay such as relay U becoming, energized by an incorrect K then againbecomes energized, completing the shunt path p'reviously traced around'resisting pick-up circuit fora relay such as relay U T ance 9 andaportion of the winding of relay BED, relay I becomes energized by itspickupcircuit previously traced. I

When the train leaves section E,F, the circuit previously traced for thearm of signal 5 is again-completed at contact 76, causing the arm. ofsignal S to move to the proceed position All parts of the apparatus willnow again attain the same condition as before the train entered sectionC-D while signal S was in dicating proceed. l I

We will now assume that another trainenters described in connection withthe first'train. We

will further assume that before the train passes signal S the operatordecides to hold the train at signal S and to arrange theapparatus.foreathird train to move along stretch Y over swltchG in the normalposition. The operator The operator is rec from the operator, closecontact P thereby completing a third pick-up circuit for relay U passingfrom terminal x through contact 48 of relay K contact P and the windingof relay U to terminal 0. With relay U energized,

the operator can, by returning lever V to its n position, cause thecircuit previously traced for magnet N to be again completed and thecircuit first traced for magnet L through. contact 59 of relay K to alsobe completed. Switch G will thereupon be returned to its normalposition. .7

We will next assume that switch G has been again reversed as previouslydescribed, and that the arm of signal S has been moved to its proceedposition. We will further assume that an eastbound train has passedsignal S, and that, before the train has passed out of section EF, theoperator desires to permit a following train to pass signal 8 On accountof relay T or relay T being deenergized, the arm, of signal S 9 is nowin its stop position, and hence relay K is'energized. The operator .willdepress push button P thereby completing a pick-up circuit for relay W,passing from battery Q, through'wires 13*, -13 andl3, winding of relayW, contacts 87 and 86 push button P contact 31 of relay it and contact70'l0 of lever V back to battery Q Relay W, upon becoming energized,completes its stick circuit passing from battery Q through wires 13 13and 13; winding of relay W, contact 88 of relay W, wire 69, winding ofrelay h and contact 7070b of lever V back to battery Q With relay Wenergized, a circuit is completed for signal S, passing from terminalzt' 'of battery Q throughcontacts '71 and 72P'of relay H contacts 73 '74and 90", and the mechanism of signal S to' terminal 0. The arm of signalS is thereupon moved to its proceed position.

We have described for a few typical conditions the operation of theapparatus comprising our invention. Following this description, theoperation of the apparatus for every other possible condition will'b'ereadily understood by re!- erence to the drawing.

is occupied, and that a second light is constantly displayed when switchF occupies its reverse position except while section B-E- -D isoccnpied. It will alsobe noted that a light is constantly displayed whenany one of the eastboundsignals is indicating proceed, and that a secondlight will be constantly displayed when any one of the westbound signalsis indicating Although we have herein shown and described onlyone formof remote control apparatus embodying our invention, it is understoodthat variouschanges' and modifications may be made therein within thescope of the appended claims without departing from the spirit and scopeof our invention.

Having thus described our invention, what we claim is:

1. In combination, an electro-responsive de-j' vice,.a controlcircuitfor said. device, an indication means responsive only to current ofgreater magnitude than the current necessary iOr controlling saiddevice, and' means 'controlledfby" said device for reducing. the":resistance infs aid circuit to permit sufiicient currenti to flow forcontrolling said indication means as well as said device, Y: 7

2. In combination, an EIECtIOrIGSDOIlSlVQ 'device, a control circuit forsaid device, an indication means responsive only to current of greatermagnitude than the current necessaryTor, putting said device into'agiven condition, and means controlled by said device for reducing theresistance in said. circuit" to vpermit s ufllcieint current to flow forcontrolling said indication means as well as for continuingsaid devicein said condition.

j 3. In combination, a railway tramcgoverning" device, a relay forcontrolling 'saiddevice, an ine dication means responsive only tocurrent of greater magnitudethan is necessaryfor operating said relay, acircuit forsaid relay. and said indication means, and means controlledby saidv traflic governing device;for' removing'a portion of the'windingof saidrelay from said circuit to permit current to fiowfor controllingsaid indication means as well as for retaining the contact of said relayin the same position as before.

4. In combination, a railway'traflic governing device, a'pair ofconductors, means forat times supplying said conductors with current forcontrolling an operation or said devicejanindication means, and meanscontrolled by saidv governing device for increasing thecurrentsuppliedto said conductors to cause said indication means todisplay a ,constant indication ,of the condition of said device.

5. In combination, an electro-responsive de-' vice,.an indicationmeans,a controlcircuit for said device and said indication means, means forsupplying said circuit with current to which said device but not saidindicationmeajns responds, and means controlled'iby said device forsupply: ing'said circuit with current to which said indication means aswell as said device responds.

6; In' combination, an electro-responsive device, an indication'means, acontrol circuit for. said device'and said indication means, means: forsupplying said circuit with current to which said device but not saidindication meansresponds, and means controlled by said device when. saiddevice has responded to said current for supply inc, Said circuit withcurrent to which sa'idiindb cation means as well as said deviceresponds.

7. In. combination, a railway track switch, a, polarized switch relayfor controlling operations of said switch to the normal or-the. reverseposition according as said relay is energized in the normal or thereverse direction, an indication means, a control circuit for said relayand said indication means, means for supplying said current with currentof normal or reverse polarity to which said switch relay but ,not saidindication means re.- sponds, and means controlled by said switch forsupplying said circuit with current to which said indicationfme'ans aswell as said switch relay. responds. V

8., In combination, a railway-track switch, a.

i a control circuit for said relay and saidindication means, means forsupplying said circuit with current of normal or reverse polarity towhich said" 6 r 7,. switch relay, but not said indication meansresponds, an indication relay energized when and onlywhen said switchoccupies a position corresponding to the-direction of energization ofsaid switch relay, andmeans controlled by said indication relay forsupplying said circuit with current to which said indication'means'aswell as said switch relay responds.

9. In combination, arailway' track'switch, a

polarized indication relay controlled by said switch, and meanscontrolled by polar contacts of'said relay for at times retaining saidswitch in the position to which said switch has lastprepolar contacts.of said indication relay for at times retaining said switch in theposition to which said switch'has last previously been operated.

11. In combination, a railway track switch, manually operable means forcontrolling the switch, an indication relay controlled by said switch,and meanscontrolled by said indication relay according to tramcconditions for controllingsaidswitch independently of said manuallyoperable means.

12. In combination, a railway track' switch,

-;manual1y' operable means for controlling the switch, anindicationf'relay controlled by said switch, a signal for governingtrafiic movements over said switch, and means controlled bysaidindication relay according to the condition of -said signal forcontrolling. said switch independently of .said' manually operablemeans.

i 13. In combination, a railway signal, a control means forsaid signal,an indication means, means for supplying said control means and saidindi- 3 cation means with current to which said'control means but notsaid indication means responds, and means controlled by said signal forsupplying said control means and said indication means with current towhich said indication means as well as said control means responds. V14. In combination, a railway track switch,

manually operable means for controlling the switch, an indication meanscontrolled by said switch, a signal ior governing traflic movementsoversaid switch, and means controlled by said signal 'according to'thecondition of said indication means for controlling said switchindependently of saidmanually operable means.

15. In combination, a railway track switch,

manually' operable means for controlling said switch, an indicationmeans controlled by said switch, and means controlled bytrafii'cconditions according to the condition of said indicationmeansfor controlling said switch independently of said manually operablemeans.

16. In combination, a railway track switch,

operating mechanism for said switch comprising a normal and areversemagnetas well asa lock magnet, a control circuit for said switch,a polarized indication relay energized in the normal or the reversedirection according as said s it h i j said lock magnet controlled byaback neutral] in its normal orits reverse position when and only whensaid circuit is energized in the normal or the reverse directionrespectively,'a circuit for contact of said indication relay, a circuitfor said normal magnet controlled by a normal polar contact of saidrelay, and a circuit for said reverse magnet controlled by a reversepolar contact of saidrelay.

17, In combination, a railway signal, a signal relay for controllingsaid signal, a control circuit for said relay, a call-on control relayfor said signal, a manually controlled pick-up circuit for said call-onrelay, and a stick circuit for said callon relay comprising the controlcircuit for said signal relay.

18. In combination, a railway signal, a signal relay for controllingsaid signal, a control circuit for said relay, a call-on control relayfor said 1 signal, a pick-up circuit for said call-on relay, and

a stick circuit for said call-on relay comprising the control circuitfor said signal relay.

19. In combination, a railway signal, an approach track circuit for saidsignal including a track relay, a second and a third track circuit eachof which includes a track relay, an approach.

locking relay, a circuit for said approach locking relay controlled bysaid approach track relay, and a second circuit for said approachlocking relay including a back contact of said second trackrelayinseries with a back contact of said third track relay andcontrolled by said signal.

20..In combination, a railway signal, an approach track circuit for saidsignal including a track relay, a second and a third track circuit I 105each of which includes a track relay, an approach locking stick relay, apick-up circuit for said approach locking relay controlled by saidapproach track relay, a second pick-up circuit for said approach lockingrelay including a back contact of said second track relay in series witha back contact of said third track relay, and a stick circuit for saidapproach locking relay controlled by said signal.

21. In combination, a railway track switch, a normal control device forsaid switch, a reverse control device for said switch, a normal controlcircuit controlled by said normal control device, a reverse controlcircuit controlled by said reverse control device, a, normal indicationcontact so controlled by said switch as to become closed when the switchis moved to its normal position, a reverseindication contact socontrolled by said switch as to become closed when the switch is movedto its reverse position, means for at times transferring the control ofsaid normal control circuit from said normal control device to saidnormal indication contact, means for at times transferring the controlof said reverse control circuit from said reverse control device to saidreverse indication contact, and means controlled by said normal andreverse control circuits, for controlling operations of said switch toits normal and reverse positions respectively.

22. In combination,'a stretch of railway track containing a switch, apolarized switch relay, a normal, control circuit controlled by a normalcontact of said switch relay, a reverse control cir-' cuit controlled bya'reverse contact of said switch relay, a polarized indication relaycontrolled by said switch, means controlled by track circuit conditionsin said stretch for at times transferring the control of said normalcontrol circuit from the normalcontact of said switch relay to a normalcontact of said indication relay and for at times transferring thecontrol of said reverse control circuit from the reverse contact of saidswitch relay to a reverse contact of said indication relay, and meanscontrolled by said normal and reverse control 'circuitsfor controllingoperations of said switch to its normal and reverse positionsrespectively.

23. In combination, a stretch of railway track containing a switch, aswitch relay, means controlled by said switch relay for controlling saidswitch, an indication relay controlled by said switch, and meanscontrolled by trafiic conditions in said stretch for at timestransferring the control of said switch fromsaid switch relay to saidindication relay.

24. In combination, a stretch of railway track containing a switch, asignal governing traflic movements over said switch, a stick relayhaving a pick-up and a stick circuit one of which is controlled by saidsignal and the other of which is controlled by track circuit conditionsin said stretch, a switch relay, means controlled by said switch relayfor controlling said switch, an indication relay controlled by saidswitch, and means controlled by said stick relay for at timestransferring the control of said switch from said switch relay to saidindication relay.

25. In combination, a stretch of railway track containing a switch, atraffic relay controlled by traffic conditions in said stretch, apolarized switch relay, a polarized indication relay so controlled bysaid switch as to be energized in the normal or the reverse directionaccording as said switch is in its normal or its reverse positionrespectively, a normal control circuit for said switch including a frontcontact of said trafiic relay and a normal contact of said switch relayin series, a second normal control circuit for said switch including aback contact of said trafiic relay and a normal contact of saidindication relay in series, a reverse control circuit for said switchincluding the front contact of said traflic relay and a reverse contactof said switch relay in series, a second reverse control circuit forsaid switch including the back contact of said traffic relay and areverse contact of said indication relay in series, and means controlledby said normal and reverse control circuits for operating said switch toits normal and reverse positions respectively.

26. In' combination, a section of railway track containing a switch, anapproach section adjoining said switch section, a signal for governingtraffic movements through said switch section into said approachsection, an approach locking relay, a track circuit for said switchsection including a track relay, a track circuit for said approachsection including a second track relay, a

pick-up circuit for said approach locking relay including aback contactof said first track relay in series with a back contact of said secondtrack relay, a stick circuit for said stick relay energized only if saidsignal indicates stop, and means controlled by said approach lockingrelay for controlling said switch.

27. In combination, a section of railway track containing a switch, anapproach section adjoining said switch section, a second approachsection adjoining said switch section, a signal for governing traflicmovements over said switch, an approach locking relay, a circuitcontrolled by trafiic conditions in said first approach section andincluding the winding of said relay for controlling said relay, a secondcircuit controlled jointly by trafiic conditions in said switch sectionand traflic conditions in said second approach section and including thewinding of said relay for controlling said relay, a third circuitcontrolled by said signal for controlling said relay, and meanscontrolled by said relay for controlling said switch.

28. In combination, a section of railway track containing a switch, anapproach section, a signal for governing traffic movements through saidswitch section into said approach section, a track circuit for. saidapproach section including a track relay, a locking relay, a pick-upcircuit for said locking relay including the winding of said lockingrelay and a back contact of said track relay,

a stick circuit for said locking relay controlled tion including a trackrelay, a pick-up circuit for said locking relay including a back contactof said track relay and controlled by said signal, a stick circuit forsaid locking relay controlled by said signal, and means controlled bysaid locking relay for at times operating said switch while said trackrelay is deenergized.

EARL M. ALLEN. CHARLES A. BROOKS.

DISCLAIMER 1,929,047.-Earl M. Allen and Charles A. Brooks, Swissvale,Pa. REMOTE CONTROL APPARATUS. Patent dated October 3, 1933. Disclaimerfiled March 15, 1985, by the assignee, The Union Switch ct SignalCompany. Hereby disclaims the subject matter of claims 19, 20, and 27.[Ofilclal Gazette April 9, 1.935.]

